一种高效的受控量子安全直接通信协议

An efficient controlled quantum secure direct communication protocol

考虑安全性和效率,提出了一种高效的基于类GHZ态的受控量子安全直接通信(CQSDC)协议。此协议中,接收方得到控制方的允许后才能恢复发送方的秘密消息,所提出协议安全、高效。结果表明预备阶段的窃听和CNOT攻击检测可以保证类GHZ态共享的安全性;利用消息来控制操作可以减少量子态的使用,从而提高效率;接收方的合法态是四个Bell态中的两个,若存在CNOT攻击,可能会出现非法态,这使得接收方在安全直传阶段也能主动发现CNOT攻击行为;通过对比证明了提出方案的高效性。

Considering the security and efficiency, an efficient controlled quantum secure direct communication（CQSDC） protocol based on GHZ-like state is proposed. In this protocol, the receiver can recover the sender＇s secret message under the permission of the controller. The proposed proctocol is secure and efficient. Results show that the eavesdropping and CNOT attack detection in preliminary stage can ensure the security of GHZ-like state sharing. Controlling operations by using messages can reduce the use of quantum states, and thus the efficiency is improved. The legal states of the receiver is the two of four Bell states.If there exists CNOT attack, illegal Bell states would appear, which enables the receiver to detect CNOT attack in secret direct communication phase. Effectiveness of the proposed scheme is proved by comparison.